Preparation And Photoelectric Properties Of CsPbX₃ Nanocomposite

All-inorganic CsPbX₃(X=Cl,Br,I)perovskite nanocrystals(NCs)materials have attracted the attention from researchers because of excellent optical properties in recent years.However,the inherent poor stability of CsPbX₃ perovskite NCs will have a great impact on its practical application,and long-term exposure to atmospheric conditions(such as light,oxygen,humidity and heat)will leads to a sharp decline in photoluminescence quantum yield(PLQY)and a phase transition.Therefore,in order to obtain perovskite NCs materials with high stability and high optical properties,these problems need to be better solved.In this work,a series of CsPbCl₂Br₁ and Eu³⁺:CsPbCl_xBr_3-x(x=2,1.5,1)NCs glasses were successfully prepared by using high temperature melting and in-situ crystallization method,and the CsPbX₃@mica nanocomposite materials were successfully fabricated by traditional hot injection method.The structure,morphology,stability and related optical properties of samples were studied in detail through a series of test and characterization methods.The specific research content is as follows:(1)A series of CsPbCl₂Br₁ and Eu³⁺:CsPbCl_xBr_3-x(x=2,1.5,1)NCs glass successfully synthesized by using high temperature melting and in-situ crystallization method,and the composition and structure of Eu³⁺:CsPbCl₂Br₁ NCs glass were discussed in detail.It not only has excellent optical properties,but also has good water resistance and cold/thermal cycle stability.In addition,Eu³⁺:CsPbCl₂Br₁ NCs glass has optical temperature sensitivity and can be used in the field of optical temperature detection.(2)A series of CsPbX₃@mica nanocomposite material with excellent optical properties were synthesized through the traditional heat injection method.The nanocomposite materials have outstanding optical properties,thermal and light irradiation stability.The CsPbBr₁I₂@mica and commercial powder YAG:Ce³⁺on the 460 nm In Ga N blue chip were constructed a white light-emitting diode(WLED).The CsPbCl_1.5Br_1.5@mica,CsPbBr₃@mica and CsPbBr₁I₂@mica were combined with 460 nm In Ga N blue chip to construct LEDs,respectively.And the display gamut covers 115.7%of the National Television System Committee(NTSC)standard color space,which broadens backlight display lighting application fields of all inorganic perovskite NCs materials.